org.plasmalabs.crypto.generation.mnemonic.Language.scala Maven / Gradle / Ivy
The newest version!
package org.plasmalabs.crypto.generation.mnemonic
import cats.implicits._
import java.nio.charset.StandardCharsets
import scala.language.implicitConversions
import scala.util.Try
import org.plasmalabs.crypto.hash.sha256
/**
* Represents a set of 2048 words that can be used to create a mnemonic.
*
* @param filePath the location of the words list
* @param hash the SHA-256 hash of the words for verification
*/
sealed abstract class Language(val filePath: String, val hash: String) {
private val wordlistDirectory: String = "bip-0039"
}
/**
* Enumeration of languages that mnemonics can be generated in
*/
object Language {
case object ChineseSimplified
extends Language("chinese_simplified.txt", "bfd683b91db88609fabad8968c7efe4bf69606bf5a49ac4a4ba5e355955670cb")
case object ChineseTraditional
extends Language("chinese_traditional.txt", "85b285c4e0e3eb1e52038e2cf4b4f8bba69fd814e1a09e063ce3609a1f67ad62")
case object English
extends Language("english.txt", "ad90bf3beb7b0eb7e5acd74727dc0da96e0a280a258354e7293fb7e211ac03db")
case object French extends Language("french.txt", "9cbdaadbd3ce9cbaee1b360fce45e935b21e3e2c56d9fcd56b3398ced2371866")
case object Italian
extends Language("italian.txt", "80d2e90d7436603fd6e57cd9af6f839391e64beac1a3e015804f094fcc5ab24c")
case object Japanese
extends Language("japanese.txt", "d9d1fde478cbeb45c06b93632a487eefa24f6533970f866ae81f136fbf810160")
case object Korean extends Language("korean.txt", "f04f70b26cfef84474ff56582e798bcbc1a5572877d14c88ec66551272688c73")
case object Spanish
extends Language("spanish.txt", "a556a26c6a5bb36db0fb7d8bf579cb7465fcaeec03957c0dda61b569962d9da5")
case object Czech extends Language("czech.txt", "f9016943461800f7870363b4c301c814dbcb8f4de801e6c87d859eba840469d5")
case object Portuguese
extends Language("portuguese.txt", "eed387d44cf8f32f60754527e265230d8019e8a2277937c71ef812e7a46c93fd")
/**
* A list of valid words in a language for generating a mnemonic phrase.
*
* @param value the valid words for creating phrases
*/
case class LanguageWordList(val value: IndexedSeq[String])
object LanguageWordList {
/**
* A failure to import a word list into a collection.
*/
sealed trait ValidationFailure
case class FileReadFailure(exception: Throwable) extends ValidationFailure
case class InvalidChecksum() extends ValidationFailure
/**
* Verifies the wordlist for the given language by calculating the SHA-256 hash
*
* @return a validated word list or a `WordListFailure` of type `InvalidChecksum`
*/
private def validateChecksum(
words: IndexedSeq[String],
expectedHash: String
): Either[ValidationFailure, IndexedSeq[String]] =
Either.cond(
sha256
.hash(words.mkString.getBytes(StandardCharsets.UTF_8))
.value
.map(byte => "%02x" format byte)
.mkString == expectedHash,
words,
InvalidChecksum()
)
/**
* Read the word list for the specified language and validate it with its specified hash value.
* @param language The language to read a word list for
* @return The work list or an error
*/
def validated(language: Language): Either[ValidationFailure, LanguageWordList] =
Try(
scala.io.Source.fromResource(s"${language.wordlistDirectory}/${language.filePath}").getLines().toIndexedSeq
).toEither
.leftMap(FileReadFailure.apply)
.flatMap(words =>
validateChecksum(words, language.hash)
.map(LanguageWordList(_))
)
}
}